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title

CSS HEX Colors

🎯 한 줄 통찰 (One-line insight)

A HEX color is specified with #RRGGBB, where each two-digit hexadecimal pair (00–ff, equal to decimal 0–255) sets the red, green, and blue intensity. [S1]

🧠 핵심 개념 (Core concepts)

HEX format — a hexadecimal color is specified with #RRGGBB, where the RR (red), GG (green), and BB (blue) hexadecimal integers specify the components of the color. [S1]
Range — each component value is between 00 and ff (the same as decimal 0 to 255). [S1]
Red example — #ff0000 is displayed as red, because red is set to its highest value (ff) and the others are set to the lowest value (00). [S1]
Black and white — black is #000000; white is #ffffff. [S1]
3-digit shorthand — the #rgb short form works only when both hexadecimal digits within each component pair are the same. [S1]

🧩 추출된 패턴 (Extracted patterns)

Equal pairs = gray — when all three pairs hold the same value, the result is a shade of gray. [S1]
Shorthand condition — #rgb is a valid abbreviation of #rrggbb only when each pair is a doubled digit (e.g. ff, cc, 99). [S1]

📖 세부 내용 (Details)

HEX Value A hexadecimal color is specified with #RRGGBB, where the RR (red), GG (green), and BB (blue) hexadecimal integers specify the components of the color. All values are between 00 and ff. #ff0000 is displayed as red, because red is set to its highest value (ff) and the others are set to the lowest value (00). Black is #000000 and white is #ffffff. [S1]

Examples of HEX color values shown on the page: [S1]

#ff0000  /* red */
#0000ff  /* blue */
#3cb371  /* medium sea green */
#ee82ee  /* violet */
#ffa500  /* orange */
#6a5acd  /* slate blue */

Shades of Gray Shades of gray are often defined using equal values for all three light sources: [S1]

#3c3c3c
#616161
#787878
#b4b4b4
#f0f0f0
#f9f9f9

3 Digit HEX Value The 3-digit hex code is a shorthand for some 6-digit hex codes. It is written as #rgb, where r, g, and b are repeated to create the full 6-digit form (#rrggbb). The 3-digit hex code can only be used when both the values (RR, GG, and BB) are the same for each component. [S1]

Examples of valid 3-digit shorthands: [S1]

#fc9  /* same as #ffcc99 */
#f0f  /* same as #ff00ff */
#b58  /* same as #bb5588 */

🛠️ 적용 사례 (Applied in summary)

The color values above are the page's own demonstration examples. No external project/commit applications found in the source.

💻 코드 패턴 (Code patterns)

6-digit HEX (language: CSS):

selector {
  color: #rrggbb; /* each pair 00–ff */
}

3-digit HEX shorthand (only when each pair is a doubled digit):

selector {
  color: #rgb; /* e.g. #f0c == #ff00cc */
}

⚖️ 비교 및 선택 기준 (Comparison & decision criteria)

6-digit vs 3-digit HEX — use the full #rrggbb form for any color; the #rgb shorthand is only usable when each component pair is a doubled digit, in which case it produces an identical color with fewer characters. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

No contradictions found in the source.

✅ 검증 상태 및 신뢰도

상태: draft
검증 단계: conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
출처 신뢰도: B (W3Schools — widely used educational reference, not a primary standards body)
신뢰 점수: 0.88
중복 검사 결과: 신규 생성 (New discovery)

🔗 지식 그래프 (Knowledge Graph)

상위/루트: CSS Tutorial
관련 개념: CSS RGB, CSS HSL, CSS Colors, CSS Background Color
참조 맥락: Referenced whenever a color is specified as a hexadecimal code, the most common form in stylesheets.

📚 출처 (Sources)

[S1] W3Schools — CSS HEX Colors — https://www.w3schools.com/css/css_colors_hex.asp

📝 변경 이력 (Change history)

2026-06-23: Initial draft synthesized from the W3Schools "CSS HEX Colors" page (Astra wiki-curation, P-Reinforce v3.1 format).

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